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183 + 67 = 250
670 / 83 = 
1830 / 250 = 73.20%
250 / 20 = 
20 / 19 = 1.05
250 / 20 = 12.50
1.05 flocks per hour
19 + 21 + 11 + 19 + 16 = 86
103 / 19 = 5.42
[[crossed out]]5.42 sp. per flock
103 / 18 = 5.722 Sp. per flock
183 / 19 = 9.63 [[birds]] per flock
236 + 89 = 325
2360 / 325 = 72.62